This removes everything but the video itself. Gone are the sidebar, comments, padding and margins. I have Adblock installed and activated, so I don't know if this lets any advertisements through. It should complement Adblock.
Install options
Install Stylish for Firefox, Thunderbird, Flock, Mozilla Suite, SeaMonkey, or Songbird. If you have Stylish already, make sure you're using the latest version and have JavaScript enabled.
You need Firefox with Stylish to use this style. Get it now, then Install Stylish, then come back here to install this style.
- load into the Stylish extension where you can preview and save it.
- this style has been updated since you installed it in Stylish.
- Greasemonkey and Opera users can load this style as a user script.